package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1. 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        // 3. 符合， 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 4. 保存验证码到分布式session
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 5. 发送验证码
        log.debug("验证码code:{}", code);
        // 返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 验证手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())) {
            return Result.fail("手机号格式错误");
        }
        // 验证code
        String code = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        // 不一致，报错
        if (code == null || !code.equals(loginForm.getCode())) {
            return Result.fail("验证码错误");
        }

        // 一致 根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();

        // 判断用户是否存在
        if (user == null) {
            // 不存在，创建用户并保存
            user = createUserWithPhone(loginForm.getPhone());
        }
        // 保存用户信息到session
        // 生成token 作为登录令牌
        String token = UUID.randomUUID().toString(true);
        // 将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        stringRedisTemplate.opsForHash().
                putAll(
                        LOGIN_USER_KEY + token,
                        BeanUtil.beanToMap(userDTO, new HashMap<>(),
                                CopyOptions.create()
                                        .setIgnoreNullValue(true)
                                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()))
                );
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.SECONDS);
        // 返回token
        return Result.ok(token);
    }

    @Override
    public Result loginByBatch(LoginFormDTO loginForm, HttpSession session) {
        // 一致 根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();

        // 判断用户是否存在
        if (user == null) {
            // 不存在，创建用户并保存
            user = createUserWithPhone(loginForm.getPhone());
        }
        // 保存用户信息到session
        // 生成token 作为登录令牌
        String token = UUID.randomUUID().toString(true);
        // 将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        stringRedisTemplate.opsForHash().
                putAll(
                        LOGIN_USER_KEY + token,
                        BeanUtil.beanToMap(userDTO, new HashMap<>(),
                                CopyOptions.create()
                                        .setIgnoreNullValue(true)
                                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()))
                );
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.SECONDS);
        // 返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        int day = now.getDayOfMonth();
        if (Boolean.TRUE.equals(stringRedisTemplate.opsForValue().getBit(key, day - 1))) {
            return Result.fail("请勿重复签到");
        }

        stringRedisTemplate.opsForValue().setBit(key, day - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        int day = now.getDayOfMonth();


        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                        BitFieldSubCommands.create().get(
                                BitFieldSubCommands.BitFieldType.unsigned(day)
                        ).valueAt(0)
                );
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null) {
            return Result.ok(0);
        }

        int count = 0;
        while (true) {
            if ((num & 1) == 1) {
                count++;
                num = num >> 1;
            } else {
                break;
            }
        }
        return Result.ok(count);
    }


    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(6));
        save(user);
        return user;
    }
}
